Pump-piston.



No. 689,973. Patented Dec. 3|, [90L W. H. KINCAID.

PUMP PISTON.

(Anplication filed June 29, 1901.)

(No Model.)

y 7 74 2 70 Q 76 K 7 1 76 7 M llNTTno STnTns ATENT FFICE.

XVALTER H. KINCAID, OF TOYAI-I, TEXAS.

PUMP-PISTON.

SPECIFICATION forming part of Letters Patent No. 689,973, dated December 31, 1901.

Application filed June 29, 1901. Serial No. 66,603. (No model.)

1'0 ctZZ whom zit may concern:

Be it known that LWALTER H. KINOAID, a citizen of the United States, and a resident of Toyah, in the county of Reeves and State of Texas, have invented a new and useful Improvement in Pump-Pistons; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of my improved pump-piston, and Figs. 2 and 3 are respectively a vertical section and a bottom view thereof.

This invention has for its object to provide a pump-piston constructed entirely of metal in order to avoid the use of packings constructed of leather or other rapidly-wearing material; and the invention consists in certain novel features of construction hereinafter fully described, and particularly pointed out in the claim.

The pump-piston comprises a stem 1 and a metallic sucker-shell 2, formed with an integral bottom 5, through which it is clamped between a shoulder 4 on the stem and a nut 5 on the lower threaded end 6 of said stem, and an open top 7, closed by a clap-valve 8, formed of a metallic disk corresponding in diameter to shell 2 and adapted to rise and fall on the stem 1, between the nut 9, which is adjustable upon the threaded upper end 10, and the shoulder 11, formed upon said stem. On the downward stroke of the piston water enters the shell through perforations 12 in the bottom 3 and displaces the clap-valve 8 upward. On the upward stroke of the piston the valve 8 seats by gravity and under the weight of the column of water which the pump lifts.

13 represents integral annular bosses on the shell, which leave a reduced portion 14 between the shell 2 and the pump-cylinder (not shown) to permit the water to escape past the valve 8. These annular bosses also form annular recesses 15 for metallic packing-rings 16, which are split at 17 to permit them to expand automatically against the inner face of the pn mp-cylind er and pack the pump-piston therein.

The pump-piston is secured to the suckerrod in the usual way by having the rod or a sleeve thereof screwed upon the upper threaded end 10.

18 represents a jam-nut for fixing the stem 1 against unscrewing from the sucker-rod.

The pump-piston constructed as above described is especially applicable to pumping water in strata bearing fine sand, where the sand enters the pump-piston. Leather cuppackings and leather valves wearout in a very short time in such places, owing to the sand cutting them out rapidly, and to make them last as long as possible they are made very tight-fitting and entail a great waste of labor in pumping in consequence of extra friction. With my improved construction the pumppiston works very freely, yet the sand is largely prevented from entering between relatively moving surfaces, and if it does enter such places its wearing effect is very slight in comparison with its wearing effect on leather. The expanding packing-rings fit the inner surface of the cylinder very accurately, and thus prevent sand entering between them from said cylinder either on the upstroke or downstroke of said pump. l/Vith the leather cup-packing there is contraction of the packing on the downstroke, which assists the sand in entering between it and the cylinder, and then follows the destructive grinding on the upstroke.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

A pump-piston comprising a stem 1 formed with a lower shoulder 4, a not 5 threaded on the end beneath said shoulder 4, an upper shoulder 11, and a nut 9 threaded on the end above the upper shoulder 11; a sucker-shell 2 formed with an integral bottom 3 clamped between the lower shoulder t and nut 5 and having perforations for the passage of water and with integral annular bosses 13 leaving a reduced portion 14 between the shell 2 and ceases the pump-cylinder and forming annular recylinder 11 and the nut 9, substantially in the re cesses l5; split metallic packing-rings 16 fitmanner and for the purposes set forth.

ted to the recesses 15 and constructed to ex- The foregoing specification signed this 24th pand automatically against the inner face of day of June, 1901.

the pump-cylinderand a metallic disk-valve 8 corresponding in diameter to the reduced WALTER KINCAID' portion of the shell 2 resting upon the upper In presence ofedge of the said shell and upon the shoulder W. C. KELLEY, 11, and adapted to rise and fall between said W. D. COWAN. 

